<template>
  <div id="app">
    <div class="todo-container">
      <div class="todo-wrap">
        <MyHeader :addTodo="addTodo"></MyHeader>
        <MyList :todos="todos" :changeStatus="changeStatus" :deleteTodo="deleteTodo"></MyList>
        <MyFooter :todos="todos" :selectAll="selectAll" :deleteAllDone="deleteAllDone"></MyFooter>
      </div>
    </div>
  </div>
</template>

<script>
  import MyHeader from './components/MyHeader.vue';
  import MyList from './components/MyList.vue';
  import MyFooter from './components/MyFooter.vue';

  export default {
    name: "App",
    data(){
      return {
        todos:JSON.parse(localStorage.getItem('todos')) || []
      }
    },
    watch:{
      todos:{
        deep:true,
        handler(){
          localStorage.setItem('todos',JSON.stringify(this.todos))
        }
      }
    },
    methods:{
      //添加事件
      addTodo(e){
        this.todos.unshift(e)
      },
      //修改事件完成状态
      changeStatus(id){
        this.todos.forEach (todo => {
          if(todo.id === id){
            todo.completed = !todo.completed
          }
        })
      },
      //删除事件
      deleteTodo(id){
        if(confirm('确定删除吗？')){
          this.todos = this.todos.filter(todo => todo.id !== id)
        }
      },
      //全选 or 全不选
      selectAll(value){
        this.todos.forEach(todo => todo.completed = value)
      },
      deleteAllDone(){
        if(confirm('确定删除吗？')){
          this.todos = this.todos.filter(todo => !todo.completed)
        }
      }
    },
    components:{MyHeader,MyList,MyFooter},
  }
    
</script>

<style>
  /*base*/
  body {
    background: #fff;
  }

  .btn {
    display: inline-block;
    padding: 4px 12px;
    margin-bottom: 0;
    font-size: 14px;
    line-height: 20px;
    text-align: center;
    vertical-align: middle;
    cursor: pointer;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
    border-radius: 4px;
  }

  .btn-danger {
    color: #fff;
    background-color: #da4f49;
    border: 1px solid #bd362f;
  }

  .btn-danger:hover {
    color: #fff;
    background-color: #bd362f;
  }

  .btn:focus {
    outline: none;
  }

  .todo-container {
    width: 600px;
    margin: 0 auto;
  }
  .todo-container .todo-wrap {
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
  }
</style>